Holding most of the control variables constant at 1990 levels fails to account for the geographic mobility of Americans.

Fixed expenses are easier to plan around because they stay the same from one month to the next. Variable expenses, on the other hand, are less predictable. Understanding both types and how they impact ...

Next, the researchers tested 48 "control variables." The purpose of these adjustments is to account for factors unrelated to USAID spending that affect mortality rates.

A control variable is like a parameter except that it has a fixed value and is not estimated from the data. You can use control variables for constants in model equations that you may want to change ...

Then an example of variable selection with four response variables and two methods is given and we conclude by making some recommendations for their routine use. The Statistician joined the Journal of ...

Scientists often want to find out if changing one variable makes a difference to other variables. In many (though not all) investigations the variables are kept constant - the control variables ...